Question

Given below are two statements:
Statement I : Chromosomes become gradually visible under light microscope during leptotene stage.
Statement II : The begining of diplotene stage is recognized by dissolution of synaptonemal complex.
In the light of the above statements, choose the correct answer from the options given below:

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Answer 1

The Correct Option is A

Chromosomes become visible under a light microscope during the leptotene stage. The diplotene stage begins with the breakdown of the synaptonemal complex, leading to the partial separation of recombined homologous chromosomes within bivalents, except at crossover points. Consequently, both statement I and statement II are accurate.

Explanation:

Statement I:

During leptotene, chromosomes begin condensing and become progressively visible via light microscopy. Although less distinct than in subsequent phases, their visibility is initiated. Statement I is therefore deemed correct.

Statement II:

The diplotene stage is definitively marked by the degradation of the synaptonemal complex. This process enables homologous chromosomes to commence separation, with the exception of chiasmata. Thus, Statement II is also accurate.

Conclusion:

Statements I and II are both accurate.

Option 1: Both Statement I and Statement II are true